I've never been one to watch shows, but consider that such a high-profile show costs millions to make and has to recoup the expenses. Using ethnic stereotypes to make jokes is clearly not popular enough with audiences anymore to warrant being included, and not just in the Simpsons.
I don't hear that the show is losing popularity because
of ethnic jokes (which were actually a very small part
of the show). Instead, a small segment of the public
pressured writers to ditch characters, & change actors
to be more PC....a symptom of newer writers who lack
an independent & original voice....& talent.
BTW, Family Guy's ethnic humor is much edgier. The
Simpsons has become very tame....relentlessly safe &
comfortable.
Corporations often do what generates revenue, not what is morally sound. In this case, they probably decided the character of Apu could cause more trouble than he was worth.
Hank Azaria who bowed to pressure, & refused to
voice Apu anymore. I highly doubt that management
would've deleted this popular character.
We don't live in the '80s or '90s anymore, so media often adapt and change or die. From what you're saying, it sounds like pop culture has well moved past what made the Simpsons popular before and the show can't adapt enough. I agree it's time for a show to call it a day when it reaches that point.
You don't watch the show, so you wouldn't have
seen the quality dropping since its golden age, &
then so precipitously in recent seasons.
The ratings are still high, just not what they were
for the 1st 9 years (golden age). But it appears
the show is coasting.
The Simpsons (1989-) ratings - Rating Graph